mirrors/django
1
0
Fork 0
mirror of https://github.com/django/django.git synced 2024-12-25 02:26:12 +00:00
Code Issues 25 Releases Wiki Activity
994c842bc9
django/tests/many_to_one/tests.py
Loic Bistuer 6685713869 Fixed E127 pep8 warnings.
2013-12-14 11:59:15 -05:00

446 lines
21 KiB
Python
Raw Blame History

from copy import deepcopy
import datetime
from django.core.exceptions import MultipleObjectsReturned, FieldError
from django.db import transaction
from django.test import TestCase
from django.utils import six
from django.utils.translation import ugettext_lazy
from .models import Article, Reporter
class ManyToOneTests(TestCase):
def setUp(self):
# Create a few Reporters.
self.r = Reporter(first_name='John', last_name='Smith', email='john@example.com')
self.r.save()
self.r2 = Reporter(first_name='Paul', last_name='Jones', email='paul@example.com')
self.r2.save()
# Create an Article.
self.a = Article(id=None, headline="This is a test",
pub_date=datetime.date(2005, 7, 27), reporter=self.r)
self.a.save()
def test_get(self):
# Article objects have access to their related Reporter objects.
r = self.a.reporter
self.assertEqual(r.id, self.r.id)
# These are strings instead of unicode strings because that's what was used in
# the creation of this reporter (and we haven't refreshed the data from the
# database, which always returns unicode strings).
self.assertEqual((r.first_name, self.r.last_name), ('John', 'Smith'))
def test_create(self):
# You can also instantiate an Article by passing the Reporter's ID
# instead of a Reporter object.
a3 = Article(id=None, headline="Third article",
pub_date=datetime.date(2005, 7, 27), reporter_id=self.r.id)
a3.save()
self.assertEqual(a3.reporter.id, self.r.id)
# Similarly, the reporter ID can be a string.
a4 = Article(id=None, headline="Fourth article",
pub_date=datetime.date(2005, 7, 27), reporter_id=str(self.r.id))
a4.save()
self.assertEqual(repr(a4.reporter), "<Reporter: John Smith>")
def test_add(self):
# Create an Article via the Reporter object.
new_article = self.r.article_set.create(headline="John's second story",
pub_date=datetime.date(2005, 7, 29))
self.assertEqual(repr(new_article), "<Article: John's second story>")
self.assertEqual(new_article.reporter.id, self.r.id)
# Create a new article, and add it to the article set.
new_article2 = Article(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
self.r.article_set.add(new_article2)
self.assertEqual(new_article2.reporter.id, self.r.id)
self.assertQuerysetEqual(self.r.article_set.all(),
[
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: This is a test>",
])
# Add the same article to a different article set - check that it moves.
self.r2.article_set.add(new_article2)
self.assertEqual(new_article2.reporter.id, self.r2.id)
self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
# Adding an object of the wrong type raises TypeError.
with transaction.atomic():
with six.assertRaisesRegex(self, TypeError,
"'Article' instance expected, got <Reporter.*"):
self.r.article_set.add(self.r2)
self.assertQuerysetEqual(self.r.article_set.all(),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
def test_assign(self):
new_article = self.r.article_set.create(headline="John's second story",
pub_date=datetime.date(2005, 7, 29))
new_article2 = self.r2.article_set.create(headline="Paul's story",
pub_date=datetime.date(2006, 1, 17))
# Assign the article to the reporter directly using the descriptor.
new_article2.reporter = self.r
new_article2.save()
self.assertEqual(repr(new_article2.reporter), "<Reporter: John Smith>")
self.assertEqual(new_article2.reporter.id, self.r.id)
self.assertQuerysetEqual(self.r.article_set.all(), [
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(self.r2.article_set.all(), [])
# Set the article back again using set descriptor.
self.r2.article_set = [new_article, new_article2]
self.assertQuerysetEqual(self.r.article_set.all(), ["<Article: This is a test>"])
self.assertQuerysetEqual(self.r2.article_set.all(),
[
"<Article: John's second story>",
"<Article: Paul's story>",
])
# Funny case - assignment notation can only go so far; because the
# ForeignKey cannot be null, existing members of the set must remain.
self.r.article_set = [new_article]
self.assertQuerysetEqual(self.r.article_set.all(),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
# Reporter cannot be null - there should not be a clear or remove method
self.assertFalse(hasattr(self.r2.article_set, 'remove'))
self.assertFalse(hasattr(self.r2.article_set, 'clear'))
def test_selects(self):
self.r.article_set.create(headline="John's second story",
pub_date=datetime.date(2005, 7, 29))
self.r2.article_set.create(headline="Paul's story",
pub_date=datetime.date(2006, 1, 17))
# Reporter objects have access to their related Article objects.
self.assertQuerysetEqual(self.r.article_set.all(), [
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(self.r.article_set.filter(headline__startswith='This'),
["<Article: This is a test>"])
self.assertEqual(self.r.article_set.count(), 2)
self.assertEqual(self.r2.article_set.count(), 1)
# Get articles by id
self.assertQuerysetEqual(Article.objects.filter(id__exact=self.a.id),
["<Article: This is a test>"])
self.assertQuerysetEqual(Article.objects.filter(pk=self.a.id),
["<Article: This is a test>"])
# Query on an article property
self.assertQuerysetEqual(Article.objects.filter(headline__startswith='This'),
["<Article: This is a test>"])
# The API automatically follows relationships as far as you need.
# Use double underscores to separate relationships.
# This works as many levels deep as you want. There's no limit.
# Find all Articles for any Reporter whose first name is "John".
self.assertQuerysetEqual(Article.objects.filter(reporter__first_name__exact='John'),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
# Check that implied __exact also works
self.assertQuerysetEqual(Article.objects.filter(reporter__first_name='John'),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
# Query twice over the related field.
self.assertQuerysetEqual(
Article.objects.filter(reporter__first_name__exact='John',
reporter__last_name__exact='Smith'),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
# The underlying query only makes one join when a related table is referenced twice.
queryset = Article.objects.filter(reporter__first_name__exact='John',
reporter__last_name__exact='Smith')
self.assertNumQueries(1, list, queryset)
self.assertEqual(queryset.query.get_compiler(queryset.db).as_sql()[0].count('INNER JOIN'), 1)
# The automatically joined table has a predictable name.
self.assertQuerysetEqual(
Article.objects.filter(reporter__first_name__exact='John').extra(
where=["many_to_one_reporter.last_name='Smith'"]),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
# ... and should work fine with the unicode that comes out of forms.Form.cleaned_data
self.assertQuerysetEqual(
(Article.objects
.filter(reporter__first_name__exact='John')
.extra(where=["many_to_one_reporter.last_name='%s'" % 'Smith'])),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
# Find all Articles for a Reporter.
# Use direct ID check, pk check, and object comparison
self.assertQuerysetEqual(
Article.objects.filter(reporter__id__exact=self.r.id),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter__pk=self.r.id),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter=self.r.id),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter=self.r),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter__in=[self.r.id, self.r2.id]).distinct(),
[
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(
Article.objects.filter(reporter__in=[self.r, self.r2]).distinct(),
[
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: This is a test>",
])
# You can also use a queryset instead of a literal list of instances.
# The queryset must be reduced to a list of values using values(),
# then converted into a query
self.assertQuerysetEqual(
Article.objects.filter(
reporter__in=Reporter.objects.filter(first_name='John').values('pk').query
).distinct(),
[
"<Article: John's second story>",
"<Article: This is a test>",
])
def test_reverse_selects(self):
a3 = Article.objects.create(id=None, headline="Third article",
pub_date=datetime.date(2005, 7, 27), reporter_id=self.r.id)
Article.objects.create(id=None, headline="Fourth article",
pub_date=datetime.date(2005, 7, 27), reporter_id=str(self.r.id))
# Reporters can be queried
self.assertQuerysetEqual(Reporter.objects.filter(id__exact=self.r.id),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(Reporter.objects.filter(pk=self.r.id),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(Reporter.objects.filter(first_name__startswith='John'),
["<Reporter: John Smith>"])
# Reporters can query in opposite direction of ForeignKey definition
self.assertQuerysetEqual(Reporter.objects.filter(article__id__exact=self.a.id),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(Reporter.objects.filter(article__pk=self.a.id),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(Reporter.objects.filter(article=self.a.id),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(Reporter.objects.filter(article=self.a),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(
Reporter.objects.filter(article__in=[self.a.id, a3.id]).distinct(),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(
Reporter.objects.filter(article__in=[self.a.id, a3]).distinct(),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(
Reporter.objects.filter(article__in=[self.a, a3]).distinct(),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(
Reporter.objects.filter(article__headline__startswith='T'),
["<Reporter: John Smith>", "<Reporter: John Smith>"],
ordered=False
)
self.assertQuerysetEqual(
Reporter.objects.filter(article__headline__startswith='T').distinct(),
["<Reporter: John Smith>"])
# Counting in the opposite direction works in conjunction with distinct()
self.assertEqual(
Reporter.objects.filter(article__headline__startswith='T').count(), 2)
self.assertEqual(
Reporter.objects.filter(article__headline__startswith='T').distinct().count(), 1)
# Queries can go round in circles.
self.assertQuerysetEqual(
Reporter.objects.filter(article__reporter__first_name__startswith='John'),
[
"<Reporter: John Smith>",
"<Reporter: John Smith>",
"<Reporter: John Smith>",
],
ordered=False
)
self.assertQuerysetEqual(
Reporter.objects.filter(article__reporter__first_name__startswith='John').distinct(),
["<Reporter: John Smith>"])
self.assertQuerysetEqual(
Reporter.objects.filter(article__reporter__exact=self.r).distinct(),
["<Reporter: John Smith>"])
# Check that implied __exact also works.
self.assertQuerysetEqual(
Reporter.objects.filter(article__reporter=self.r).distinct(),
["<Reporter: John Smith>"])
# It's possible to use values() calls across many-to-one relations.
# (Note, too, that we clear the ordering here so as not to drag the
# 'headline' field into the columns being used to determine uniqueness)
d = {'reporter__first_name': 'John', 'reporter__last_name': 'Smith'}
self.assertEqual([d],
list(Article.objects.filter(reporter=self.r).distinct().order_by()
.values('reporter__first_name', 'reporter__last_name')))
def test_select_related(self):
# Check that Article.objects.select_related().dates() works properly when
# there are multiple Articles with the same date but different foreign-key
# objects (Reporters).
r1 = Reporter.objects.create(first_name='Mike', last_name='Royko', email='royko@suntimes.com')
r2 = Reporter.objects.create(first_name='John', last_name='Kass', email='jkass@tribune.com')
Article.objects.create(headline='First', pub_date=datetime.date(1980, 4, 23), reporter=r1)
Article.objects.create(headline='Second', pub_date=datetime.date(1980, 4, 23), reporter=r2)
self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'day')),
[
datetime.date(1980, 4, 23),
datetime.date(2005, 7, 27),
])
self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'month')),
[
datetime.date(1980, 4, 1),
datetime.date(2005, 7, 1),
])
self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'year')),
[
datetime.date(1980, 1, 1),
datetime.date(2005, 1, 1),
])
def test_delete(self):
self.r.article_set.create(headline="John's second story",
pub_date=datetime.date(2005, 7, 29))
self.r2.article_set.create(headline="Paul's story",
pub_date=datetime.date(2006, 1, 17))
Article.objects.create(id=None, headline="Third article",
pub_date=datetime.date(2005, 7, 27), reporter_id=self.r.id)
Article.objects.create(id=None, headline="Fourth article",
pub_date=datetime.date(2005, 7, 27), reporter_id=str(self.r.id))
# If you delete a reporter, his articles will be deleted.
self.assertQuerysetEqual(Article.objects.all(),
[
"<Article: Fourth article>",
"<Article: John's second story>",
"<Article: Paul's story>",
"<Article: Third article>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(Reporter.objects.order_by('first_name'),
[
"<Reporter: John Smith>",
"<Reporter: Paul Jones>",
])
self.r2.delete()
self.assertQuerysetEqual(Article.objects.all(),
[
"<Article: Fourth article>",
"<Article: John's second story>",
"<Article: Third article>",
"<Article: This is a test>",
])
self.assertQuerysetEqual(Reporter.objects.order_by('first_name'),
["<Reporter: John Smith>"])
# You can delete using a JOIN in the query.
Reporter.objects.filter(article__headline__startswith='This').delete()
self.assertQuerysetEqual(Reporter.objects.all(), [])
self.assertQuerysetEqual(Article.objects.all(), [])
def test_regression_12876(self):
# Regression for #12876 -- Model methods that include queries that
# recursive don't cause recursion depth problems under deepcopy.
self.r.cached_query = Article.objects.filter(reporter=self.r)
self.assertEqual(repr(deepcopy(self.r)), "<Reporter: John Smith>")
def test_explicit_fk(self):
# Create a new Article with get_or_create using an explicit value
# for a ForeignKey.
a2, created = Article.objects.get_or_create(id=None,
headline="John's second test",
pub_date=datetime.date(2011, 5, 7),
reporter_id=self.r.id)
self.assertTrue(created)
self.assertEqual(a2.reporter.id, self.r.id)
# You can specify filters containing the explicit FK value.
self.assertQuerysetEqual(
Article.objects.filter(reporter_id__exact=self.r.id),
[
"<Article: John's second test>",
"<Article: This is a test>",
])
# Create an Article by Paul for the same date.
a3 = Article.objects.create(id=None, headline="Paul's commentary",
pub_date=datetime.date(2011, 5, 7),
reporter_id=self.r2.id)
self.assertEqual(a3.reporter.id, self.r2.id)
# Get should respect explicit foreign keys as well.
self.assertRaises(MultipleObjectsReturned,
Article.objects.get, reporter_id=self.r.id)
self.assertEqual(repr(a3),
repr(Article.objects.get(reporter_id=self.r2.id,
pub_date=datetime.date(2011, 5, 7))))
def test_manager_class_caching(self):
r1 = Reporter.objects.create(first_name='Mike')
r2 = Reporter.objects.create(first_name='John')
# Same twice
self.assertTrue(r1.article_set.__class__ is r1.article_set.__class__)
# Same as each other
self.assertTrue(r1.article_set.__class__ is r2.article_set.__class__)
def test_create_relation_with_ugettext_lazy(self):
reporter = Reporter.objects.create(first_name='John',
last_name='Smith',
email='john.smith@example.com')
lazy = ugettext_lazy('test')
reporter.article_set.create(headline=lazy,
pub_date=datetime.date(2011, 6, 10))
notlazy = six.text_type(lazy)
article = reporter.article_set.get()
self.assertEqual(article.headline, notlazy)
def test_values_list_exception(self):
expected_message = "Cannot resolve keyword 'notafield' into field. Choices are: %s"
self.assertRaisesMessage(FieldError,
expected_message % ', '.join(Reporter._meta.get_all_field_names()),
Article.objects.values_list,
'reporter__notafield')
self.assertRaisesMessage(FieldError,
expected_message % ', '.join(['EXTRA'] + Article._meta.get_all_field_names()),
Article.objects.extra(select={'EXTRA': 'EXTRA_SELECT'}).values_list,
'notafield')
Reference in New Issue View Git Blame Copy Permalink